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Kynar Wire Blue (5M) £3.85

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Kynar wire 30 AWG (Blue 5M length)

Polyvinylidene (PVDF) or KYNAR is a thermoplastic fluoropolymer that is often used as insulation jacketing for wire and cable that provides a variety of benefits. It can be used across multiple industries.

KYNAR wire insulation, when used as a jacketing material for cables, is ideally suited for applications that require flexibility, strength, and low density. It boasts abilities that allow it to bend with durability throughout heavy use.

Specifically, it is extremely beneficial in applications that require chemical resistance, as it is capable of withstanding intense substances such as chlorine and hydrogen gases. KYNAR-insulated cable and wire also provides resistance to high temperatures, flames, and low smoke generation.

Tech Tin Files: Cause of conductivity In Metal Wires

  • A metal consists of a lattice of atoms, each with an outer shell of electrons that freely dissociate from their parent atoms and travel through the lattice. This is also known as a positive ionic lattice. This 'sea' of dissociable electrons allows the metal to conduct electric current. When an electrical potential difference (a voltage) is applied across the metal, the resulting electric field causes electrons to drift towards the positive terminal. The actual drift velocity of electrons is very small, in the order of magnitude of a meter per hour. However, as the electrons are densely packed in the material, the electromagnetic field is propagated through the metal at the speed of light. The mechanism is similar to transfer of momentum of balls in a Newton's cradle.
  • Near room temperatures, metals have resistance. The primary cause of this resistance is the collision of electrons with the atoms that make up the crystal lattice. This acts to scatter electrons and lose their energy on collisions rather than on linear movement through the lattice. Also contributing to resistance in metals with impurities are the resulting imperfections in the lattice.
  • The larger the cross-sectional area of the conductor, the more electrons per unit length are available to carry the current. As a result, the resistance is lower in larger cross-section conductors. The number of scattering events encountered by an electron passing through a material is proportional to the length of the conductor. The longer the conductor, therefore, the higher the resistance. Different materials also affect the resistance.

Tech Tin Files: Causes of conductivity In semiconductors and insulators

  • In metals, the Fermi level lies in the conduction band (see Band Theory, above) giving rise to free conduction electrons. However, in semiconductors the position of the Fermi level is within the band gap, approximately half-way between the conduction band minimum and valence band maximum for intrinsic (undoped) semiconductors. This means that at 0 kelvin, there are no free conduction electrons, and the resistance is infinite. However, the resistance continues to decrease as the charge carrier density in the conduction band increases.
  • In extrinsic (doped) semiconductors, dopant atoms increase the majority charge carrier concentration by donating electrons to the conduction band or accepting holes in the valence band. For both types of donor or acceptor atoms, increasing dopant density reduces resistance. Hence, highly doped semiconductors behave metallically.
  • At very high temperatures, the contribution of thermally generated carriers dominate over the contribution from dopant atoms, and the resistance decreases exponentially with temperature.